Can someone please help converting from mps to mph for my graph in matplotlib to show up in mph. I have this code:

def mps_to_mph(mps):
        return 2.23694 * mps

and this is my graph:

import matplotlib.pyplot as plt
import matplotlib.dates as mdates
fig = plt.figure(figsize=(10,5))     
ax = plt.subplot(111)
plt.grid()
ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d %H:%M:%S'))
fig.autofmt_xdate()

# Pass the DataFrame 'sheet' to the plot function, and reference columns by name
plt.plot(sheet['Date Time'], sheet['Wind Speed (m/s)'], color='crimson') 

plt.title('Wind Speed, Providence, RI', fontsize=12)
plt.xlabel('Date', fontsize=11)
plt.ylabel('Wind Speed (m/s)', fontsize=11)
plt.show()

But I am not sure how to or where to input the conversion code for the conversion to reflect in the graph

I input the code for the graph and the conversion above it, but it still gave me mps